<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      @click-left="onClickLeft"
      title="黑马头条"
    ></van-nav-bar>

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap"></div>
      <!-- 加载完成-文章详情 -->
      <div class="article-detail" v-else-if="article.title">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>
          <!-- $event 自定义事件中子组件传过来的参数 -->
          <!-- $event 默认事件中是事件对象 -->
          <!-- 关注用户组件 -->
          <!-- :is_followed="article.is_followed" -->
          <followUser
            v-model="article.is_followed"
            :user_id="article.aut_id"
            @update-is_followed="article.is_followed = $event"
          ></followUser>
        </van-cell>
        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          v-html="article.content"
          ref="article-content"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 评论列表 -->
        <CommentList
          :list="commentList"
          :source="article.art_id"
          @onload-success="totalCommentcount = $event.total_count"
          @reply-click="onReplyClick"
        ></CommentList>
      </div>
      <!-- 加载失败：404 -->
      <div class="error-wrap" v-else-if="errStatus === 404">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div class="error-wrap" v-else>
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn">点击重试</van-button>
      </div>
    </div>

    <!-- 发表评论弹出层 -->
    <van-popup v-model="isPostShow" position="bottom">
      <!-- 对文章添加评论 组件 -->
      <commentPost :userId="article.art_id" @post-success="onPostSuccess" />
    </van-popup>

    <!-- 回复评论弹出层 -->
    <van-popup v-model="isReplyShow" position="bottom" style="height: 90%">
      <!-- 回复评论组件 -->
      <commentReply :comment="currentComment"></commentReply>
    </van-popup>

    <!-- 底部区域 -->
    <div class="article-bottom" v-if="article.art_id">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="isPostShow = true"
        >写评论</van-button
      >
      <!-- 评论组件 info:评论条数-->
      <van-icon name="comment-o" :info="totalCommentcount" color="#777" />
      <!-- 收藏组件 -->
      <CollectArticle
        v-model="article.is_collected"
        :article-id="article.art_id"
      ></CollectArticle>
      <!-- 点赞组件  -->
      <likeArticle v-model="article.attitude" :articleId="article.art_id">
      </likeArticle>
      <van-icon name="share" color="#777777"></van-icon>
    </div>
  </div>
</template>

<script>
import { getArticleById } from "@/api/article";
import { Form, ImagePreview } from "vant";
import CommentList from "./components/comment-list.vue";
import CollectArticle from "@/components/collect-article.vue";
import likeArticle from "@/components/like-article";
import followUser from "@/components/follow-user";
import commentPost from "@/views/article/components/comment-post";
import commentReply from "@/views/article/components/comment-reply"

export default {
  name: "ArticleIndex",
  components: {
    CommentList,
    followUser,
    CollectArticle,
    likeArticle,
    commentPost,
    commentReply
  },
  props: {
    articleId: {
      type: [Number, String],
      required: true,
    },
  },
  // 依赖注入
  provide:function () {
    return{
      articleId : this.articleId,
      
    }
  },
  data() {
    return {
      article: {},
      loading: true, // 加载中的 loading
      errStatus: 0, // 失败的状态码
      followLoading: false, //loading 状态
      totalCommentcount: 0, //评论条数
      isPostShow: false, //发评论的弹层显示
      commentList: [], //存放新评论的数组
      isReplyShow: false, //回复评论的弹层显示
      currentComment: {} // 当前回复的评论项
    };
  },
  created() {
    this.loadArticle();
  },
  methods: {
    onPostSuccess(data) {
      // 关闭弹层
      this.isPostShow = false;
      // 将新评论unshift入新数组
      this.commentList.unshift(data.new_obj);
      // 评论条数+1
      this.totalCommentcount++;
    },
    // 文章详情
    async loadArticle() {
      try {
        this.loading = true;
        const { data } = await getArticleById(this.articleId);

        this.article = data.data;
        setTimeout(() => {
          this.previewImage();
        });
        // console.log(this.article);
      } catch (error) {
        if (error.response && error.response.status === 404) {
          this.errStatus = 404;
        }
      }
      this.loading = false;
    },
    onClickLeft() {
      this.$router.back();
    },
    onReplyClick(comment) {
      // comment 的传递方向
      // item->list->index
      console.log(comment);
      this.currentComment = comment
      this.isReplyShow = true;
    },
    // 预览图片
    previewImage() {
      // 找到内容元素
      const articleContent = this.$refs["article-content"];
      // 得到所有的 img 节点
      const imgs = articleContent.querySelectorAll("img");
      const images = [];
      imgs.forEach((item, index) => {
        images.push(item.src);

        item.onclick = () => {
          ImagePreview({
            images: images,
            startPosition: index,
          });
        };
      });
    },
  },
};
</script>

<style scoped lang="less">
@import "./github-markdown.css";
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>